Molded case circuit breaker

Abstract

The invention discloses a molded case circuit breaker. The molded case circuit breaker comprises a case body. The case body is provided with a traction assembly, adjusting screws, bimetallic strips and static iron cores. The adjusting screws are fixedly connected with the bimetallic strips. The static iron cores are fixedly connected with the bimetallic strips. The traction assembly comprises instantaneous traction rods and a delay traction rod. The instantaneous traction rods include movable iron cores and a fixed shaft. The movable iron cores correspond to the static iron cores in position. The fixed shaft and the case body are fixed axially. The delay traction rod is movably arranged on the instantaneous traction rods and can move in the arrangement direction of the instantaneous traction rods. The position, corresponding to the adjusting screws, of the delay traction rod is provided with inclined planes, and the inclined planes interact with the adjusting screws. According to the molded case circuit breaker provided with the instantaneous traction rods and the delay traction rod, the instantaneous traction rods and the delay traction rod are mutually independent and have no interference with one aother when the instantaneous tripping function and the delayed tripping function are adjusted, and delivery debugging of the molded case circuit breaker is facilitated.

Description

technical field [0001] The invention relates to a circuit breaker, more specifically, to a molded case circuit breaker. Background technique [0002] The molded case circuit breaker can automatically cut off the current after the current exceeds the trip setting. The molded case circuit breaker includes a casing made of plastic insulators and a control component installed inside the casing. Molded case circuit breakers usually include overload protection and There are two functions of short-circuit instantaneous protection and overload delay protection, that is, the double gold plate is deformed through heat conduction. When the circuit breaker is overloaded, overheating will cause the double gold plate to bend and deform, thereby triggering the rotation of the drawbar to realize tripping. The tripping mechanism is usually provided with a sloped adjustment rod on the drawbar, and the horizontal position of the adjustment rod is adjusted through the knob, so that the distance...

AI Technical Summary

Problems solved by technology

[0003] Molded case circuit breakers in the prior art usually only have one draw bar, the upper part of the draw bar is provided with an adjustment rod at the position corresponding to the adjusting screw, and the lower part of the draw bar is provided with a moving iron core. Due to the reason of the type design, the adjustment of instantaneous tripping and delayed tripping will affect each other. The debugging of the circuit breaker is a very troublesome process, resulting in low production efficiency, and it is difficult to ensure the accuracy of instantaneous tripping and delayed tripping. If the instantaneous tripping function and delayed tripping function are not adjusted properly, it will easily affect Working performance of later molded case circuit breakers in use

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